Yes maybe there some converteU can use, cause it can read the file directly. I sugest WinGX* (check in CCP14) to display the map as well as in FullProf, or VESTA to display 3D.
As far I know FullProf Suite has GFourier, but think it is incompatible with GSAS map files. The solution is to use an excellent VESTA (Momma & Izumi) visualization tool, capable to read many structural (coordinates) and volumetric (density) formats, particularly, GSAS ASCII Fourier files. By the way, it is free of cost!
Thank you Michael and Artem. I tried putting GSAS CIF into Fullprof. I am working on it now. It has thrown some 3D plot. But the problem with GFourier is (as far as I Know) It wont give (x,y,z) when we click on the map as GSAS DELF gives. Problem with GSAS Fourier is (as far as I Know), Graphic resolution is not good. I wish both should be in one software.
Now I will try Vesta as You people suggested me!...
Which format you exported from GSAS?? is it a *.*.grid file or .ins file???. I am unable to open any of these files in map view. In fact map view takes the file but throws nothing.
you may use Scott Belmonte's "FOUE" program to covert GSAS Fourier map file to WinGX map format file and use program WinGX to generate 2D plot. even more features